Unfortunately, listening in on ATC traffic in Germany is a felony, unless you're in possesion of a BZF (Beschränkt gültiges Sprechfunkzeugnis für den Flugfunkdienst, license for using radio on VFR flights) or AZF (Allgemeines Sprechfunkzeugnis für den Flugfunkdienst, general license for using radio in air traffic) and you're actually participating in the traffic (you're either in the cockpit, or in the atc facility). So even if you're a pilot, it'd be illegal to bring your handheld and hang out at the airport just to listen in on the chatter, much less stream it over the internet.